Which one of the following acids is also known as Vitamin C?

Vitamin C is chemically known as ascorbic acid [2]. It is a naturally occurring carboxylic acid found in various food sources, particularly citrus fruits like oranges and lemons, as well as amla [3]. Ascorbic acid serves as a vital nutrient and antioxidant in the human body [4]. In contrast, the other options represent different organic acids: methanoic acid (also known as formic acid) is found in ant and nettle stings [2]; lactic acid is found in sour milk or curd [2]; and tartaric acid is present in tamarind, grapes, and unripe mangoes [3]. Ascorbic acid is unique among these for its specific role as a vitamin, whereas the others are primarily metabolic byproducts or defensive chemicals in nature [3].

Sources

1. [2] https://www.ncert.nic.in/textbook/pdf/gesc104.pdf
2. [3] Science , class X (NCERT 2025 ed.) > Chapter 2: Acids, Bases and Salts > Table 2.3 Some naturally occurring acids > p. 28
3. [4] https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/isoascorbic-acid